The invention provides a balancing valve. The balancing valve (1) is provided with a body (2) that has two connector pipes (3 and 4). In the body (2) a seat (5) is housed which is closed with a head (6) mounted on a stem (7) where the stem (7) is seated in a gland (9). Outside the gland (9) there is a knob (10) engaged with the stem (7). The head (6) is made of plastics and it is connected with an adjustment ring (12) which is made of plastics.
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1. A balancing valve comprising:
a body having two connector pipes, where a seat is housed, said seat being closed with a head mounted on a stem, which stem is seated in a gland outside of which a knob connected with the stem is positioned, wherein the head is made of a plastic material, wherein the head is connected to an adjustment ring which is made of a plastic material, wherein the head is comprised of an inner sleeve having a closed side at a closing seat side of the valve, wherein the head includes an integral external ring extending radially from the inner sleeve in proximity of the closed side of the inner sleeve, wherein the head including the inner sleeve and the external ring constitutes a single piece made of the plastic material, wherein the head and the adjustment ring are connected by a threaded connection such that the adjustment ring extends around the inner sleeve at the closed side of the inner sleeve between the external ring and the closing seat side of the valve, wherein a head seal is positioned between the external ring and the adjustment ring, wherein the thread of the threaded connection is formed both in an outer surface of the inner sleeve of the head and in an inner surface of the adjustment ring, wherein the threaded connection between the head and the adjustment ring is secured by a self-tapping screw, wherein the head is provided with an integral outer sleeve extending from the external ring in a direction coincident with the extension of the inner sleeve, where both sleeves are coaxial.
6. The valve of
8. The valve of
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The subject invention provides a balancing valve.
Balancing valves are designed for adjustment and closing of the flow in central heating networks, in hot and cold utility water installations, in air conditioning and cooling installations.
An adjustment poppet valve is known that is formed of a body closed with a cover, and with a seat of which a suitably shaped head on a stem cooperates.
The stem has a knob at one end and is guided in a threaded part in the cover where it is also sealed. The valve is provided with a scale that shows the positioning of the head relative to the seat. Usually, the scale shows the number of turns of the stem from the complete closing state and division of one full turn.
An important issue in the construction of an adjustment valve is to obtain repeatability of the assumed extent of the valve aperture, so as to make the construction allow to close the valve when needed, where re-opening is possible solely to a preset value.
Known balancing valves are provided with a head assembly which is constituted by a head and an adjustment ring made of metal. Most frequently, the latter is cast iron or non-ferrous metal alloys. Closing heads made of these materials require high precision mechanical shaping. Such heads are at the same time expensive in manufacturing due to both the material cost, in particular of non-ferrous metals, and the machining costs related first to casting a product and then to mechanical shaping thereof.
Heads made of metal are very susceptible to precision of manufacture and in the case of even minor dimensioning defects they may cause leakages at the contact area with the seat, and this is why in valves of this kind, equipped with metallic heads, it is necessary to use additional solutions to enhance sealing between the seat and the valve, for example resilient head suspension.
The balancing valve according to the invention is provided with a body having two connector pipes. In the body, a seat is housed, said seat being closed by a head fixed on a stem which stem is fixed on a gland. Outside the gland there is a knob engaged to the stem. The head of the valve is made of plastics.
Preferably, the valve head is connected to an adjustment ring made of plastics.
It is preferable for the head and adjustment ring to be connected by means of a threaded connection, and between the head and the adjustment ring a head seal is positioned.
It is also preferable to have the thread of the threaded connection formed both in the head and in the adjustment ring.
Another preferable feature is that the threaded connection between the head and the adjustment ring is secured with a self-tapping screw.
It is also preferable to make the head of polysulfone.
It is preferable to make the adjustment ring of polysulfone.
It is preferable to make the head by an injection method.
It is also preferable to make the adjustment ring by a injection method.
Another preferable feature is that the head is constituted by an inner sleeve, closed at side of the valve closing seat, provided with an external ring extending in proximity of the closed side of the sleeve.
It is preferable to provide the head with an outer sleeve extending from the external ring in a direction coincident with the extension of the internal sleeve, where both sleeves are coaxial.
It is also preferable to provide the side of the head closed on the seat side in the proximity of the inner sleeve, with relief openings.
Another preferable feature is that the internal part of the inner sleeve is provided with a thread, and preferably the thread is formed in an insert, and more preferably the threaded insert is made of metal.
The object of the invention is presented by its embodiments in the drawings.
As shown in the drawing of
The head 6 is connected to an adjustment ring 12 on the seat 5 side of the valve 1. The connection of the head 6 with the adjustment ring 12 is a threaded connection, and on the head 6 an outer thread is formed, while in the adjustment ring 12 an internal thread is formed. Between the head 6 and the adjustment ring 12 there is placed a seal 13 of the head 6, formed in an L shape and seated at one side in a groove formed in the adjustment ring 12, and on the other side in a groove formed in the front surface of the head 6. In assembling of the head 6 with the adjustment ring 12 on the threaded connection, the position of the seal 13 of the head 6 becomes fixed. Upon assembling of the head 6 with the adjustment ring 12 the threaded connection is locked by a self-tapping screw 14 that is screwed in.
The head 6 and the adjustment ring 12 are made of plastics which is a polysulfone being a polymer containing a —SO2— group and an aromatic ring in the main chain. Both the head 6 and the adjustment ring 12 are made by an injection method, while subject to mechanical shaping are solely some surfaces, for example the ones where the seals are located. Thus in the embodiment shown in
The inlet connector pipe 3 and the outlet connector pipe 4 in the body 2 of the valve 1 are provided with control passages 15 that are closed with plugs 16.
As shown in
The balancing valves shown in
The head 1 has an internally formed thread that cooperates with a thread formed on the outer surface of the stem 7.
For particularly large valves 1, the head 6 may be equipped inside with a metallic threaded sleeve that cooperates with the stem 7 threaded on its external surface.
As shown in the drawing of
The head 6 is also made of plastics which in this case is polysulfone. Also the adjustment ring 12 is made of polysulfone. The head 6 of the valve 1 is formed in a shape of an inner sleeve 19 closed from the seat 5 side of the valve 1. The inner sleeve 19 is provided with an external ring 20 extending in proximity of the closed side of the inner sleeve 19 of the head 6 of the valve 1. The inner sleeve 19 and the external ring 20 are coaxial. The external ring 20 of the head 6 of the valve 1 has, on the seat 5 side of the valve 1, a seat where a seal 13 of the head 6 of the valve 1 is housed.
In the embodiment shown in
The head 6 of the valve 1 and the adjustment ring 12 are connected by means of a threaded connection. The thread of this connection is formed on the outer surface of the internal sleeve 19 below the external ring 20 and on the inner surface of the opening in the adjustment ring 12. This direct connection between the components of the valve is shown in
The inner part of the inner sleeve 19 shown in
Embodiments of the balancing valve according to the invention make it possible to achieve several objectives at the same time. It provides for lowering of the manufacturing costs, enhances the corrosion resistance of the head 6 of the valve 1, and at the same time, due to the properties of the material of which the head 6 and adjustment ring 12 are made, it allows for self-adjusting of the head 6 and the adjustment ring 12 fitted into the valve seat, resulting from elasticity of the plastics.
Lisowski, Andrzej, Rogalka, Marcin, Deren, Boguslaw, Golabek, Edmund
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Apr 09 2013 | ROGALKA, MARCIN | ZETKAMA SPOLKA AKCYJNA | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 030371 | /0251 | |
Apr 09 2013 | LISOWSKI, ANDRZEJ | ZETKAMA SPOLKA AKCYJNA | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 030371 | /0251 | |
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Apr 09 2013 | GOLABEK, EDMUND | ZETKAMA SPOLKA AKCYJNA | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 030371 | /0251 | |
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